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[PATCH v3 4/6] hw/isa/piix3: Avoid Xen-specific variant of piix3_write_c
From: |
Bernhard Beschow |
Subject: |
[PATCH v3 4/6] hw/isa/piix3: Avoid Xen-specific variant of piix3_write_config() |
Date: |
Sun, 12 Mar 2023 13:02:19 +0100 |
Subscribe to pci_bus_fire_intx_routing_notifier() instead which allows for
having a common piix3_write_config() for the PIIX3 device models.
While at it, move the subscription into machine code to facilitate resolving
TYPE_PIIX3_XEN_DEVICE.
In a possible future followup, pci_bus_fire_intx_routing_notifier() could
be adjusted in such a way that subscribing to it doesn't require
knowledge of the device firing it.
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
---
hw/i386/pc_piix.c | 18 ++++++++++++++++++
hw/isa/piix3.c | 22 +---------------------
2 files changed, 19 insertions(+), 21 deletions(-)
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 99232701b1..1b70470dcd 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -88,6 +88,21 @@ static int pc_pci_slot_get_pirq(PCIDevice *pci_dev, int
pci_intx)
return (pci_intx + slot_addend) & 3;
}
+static void piix_intx_routing_notifier_xen(PCIDevice *dev)
+{
+ int i;
+
+ /* Scan for updates to PCI link routes (0x60-0x63). */
+ for (i = 0; i < PIIX_NUM_PIRQS; i++) {
+ uint8_t v = dev->config_read(dev, PIIX_PIRQCA + i, 1);
+ if (v & 0x80) {
+ v = 0;
+ }
+ v &= 0xf;
+ xen_set_pci_link_route(i, v);
+ }
+}
+
/* PC hardware initialisation */
static void pc_init1(MachineState *machine,
const char *host_type, const char *pci_type)
@@ -239,6 +254,9 @@ static void pc_init1(MachineState *machine,
pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
if (xen_enabled()) {
+ pci_device_set_intx_routing_notifier(
+ pci_dev, piix_intx_routing_notifier_xen);
+
/*
* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also
diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index 7a31caf2b6..737f5c6a5d 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -121,26 +121,6 @@ static void piix3_write_config(PCIDevice *dev,
}
}
-static void piix3_write_config_xen(PCIDevice *dev,
- uint32_t address, uint32_t val, int len)
-{
- int i;
-
- /* Scan for updates to PCI link routes (0x60-0x63). */
- for (i = 0; i < len; i++) {
- uint8_t v = (val >> (8 * i)) & 0xff;
- if (v & 0x80) {
- v = 0;
- }
- v &= 0xf;
- if (((address + i) >= PIIX_PIRQCA) && ((address + i) <= PIIX_PIRQCD)) {
- xen_set_pci_link_route(address + i - PIIX_PIRQCA, v);
- }
- }
-
- piix3_write_config(dev, address, val, len);
-}
-
static void piix3_reset(DeviceState *dev)
{
PIIX3State *d = PIIX3_PCI_DEVICE(dev);
@@ -390,7 +370,7 @@ static void piix3_xen_class_init(ObjectClass *klass, void
*data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
- k->config_write = piix3_write_config_xen;
+ k->config_write = piix3_write_config;
k->realize = piix3_realize;
}
--
2.39.2
- [PATCH v3 1/6] include/hw/xen/xen: Rename xen_piix3_set_irq() to xen_intx_set_irq(), (continued)
- [PATCH v3 1/6] include/hw/xen/xen: Rename xen_piix3_set_irq() to xen_intx_set_irq(), Bernhard Beschow, 2023/03/12
- [PATCH v3 3/6] hw/isa/piix3: Wire up Xen PCI IRQ handling outside of PIIX3, Bernhard Beschow, 2023/03/12
- [PATCH v3 2/6] hw/isa/piix3: Reuse piix3_realize() in piix3_xen_realize(), Bernhard Beschow, 2023/03/12
- [PATCH v3 6/6] hw/isa/piix3: Resolve redundant TYPE_PIIX3_XEN_DEVICE, Bernhard Beschow, 2023/03/12
- [PATCH v3 5/6] hw/isa/piix3: Resolve redundant k->config_write assignments, Bernhard Beschow, 2023/03/12
- [PATCH v3 4/6] hw/isa/piix3: Avoid Xen-specific variant of piix3_write_config(),
Bernhard Beschow <=